Speakers

Biography

Dr. Zhongsheng Guo studied soil sciences at Northwestern A & F University, China, and graduated with an MS in 2000. He then researches the high-quality and sustainable method of forest, grass, crop and soil and water conservation in Northwestern A & F University, CAS & MWR. He received him PhD degree in 2004 at the Northwestern A & F University. He obtained the position of an Professor at Northwestern A & F University,CAS & MWR. He has published a couple of research articles in SCI(E) journals. He put forward the resource use limit by plants (RULP), vegetation carrying capacity (VCC) , the critical period of plant resource relationship regulation, and the new theory of soil and water conservation.

Abstract

Since 2017, the term high-quality development has been proposed in China, so Agriculture development has entered the new stage of Agriculture high-quality product， which is to take some measures and methods to make the land produce the maximum output and services to meet people's yearning for a better life and the needs of agricultural production services. However, because of the overuse of fertilizer pesticides and the introduction of un-native plant species or vatiaries, exotic plant species or varieties, plant resources relationship has changed into unbalanced relation, which will easily result in soil degradation, vegetation degradation and crop failure or waste of soil water resources, and are unfavorable for the sustainable utilization of resources and Agriculture high-quality development. Therefore, adjusting the plant resources relationship and obtaining the maximum yield and services is necessary to realize the sustainable utilization of resources and crop high-quality management. However, there is no universally accepted theory to regulate plant resource relationships in practice. Here we show that the theories of sustainable use of soil resources and Agriculture high-quality development include the resources use limit by plants (RULP), vegetation carrying capacity (VCC) and the critical period of plant resource relationship regulation, which includes the space resources use limit by plants (SRULP), space vegetation carrying capacity (SVCC) and the critical period of plant space relationship regulation in soil water and soil nutrient-rich regions, the soil water resources use limit by plants (SWRULP), soil water vegetation carrying capacity (SWVCC) and the critical period of plant water relationship regulation in the water-limited regions and the soil nutrient resources use limit by plants (SNRULP) , soil nutrient vegetation carrying capacity (SNVCC) and the critical period of plant nutrient relationship regulation in soil nutrient limited regions. The SWRULP is the soil water resources in the maximum infiltration depth (MID) in which the soil water content in every soil layer is equal to the wilting coefficient. The wilting coefficient is expressed by the wilting coefficient of the indicated plant in a plant community. SWVCC is the population or density of indicator plants in a plant community when the soil water supply is equal to soil water consumption in the root zone in the critical period of plant resources relationship regulation (CPPSRR), which changes with plant community type, site condition, and time. When soil water resources in the MID are equal to the SWRULP, the plant water relation enters CPPSRR. The ending time of CPPSRR is the ineffective time. To get the maximum yield and service, we must select the best plant species or varieties, take suitable initial planting densities, and use effective measures or methods to ensure the plant is normal to grow and achieve the cultivation goal. If the plant density is more than the VCC in the critical period of plant resources relationship regulation, the plant resources relationship has to be regulated based on VCC to get the maximum yield and service to realize sustainable use of soil resources and high-quality production. As for fruit or crops, the leaf and delicate fruit relation has to be regulated according to the quantity of leaf when the plant density is equal to the VCC in the critical period of plant resources relationship regulation. High-quality fruit is the fruit that meets the needs of the market.
Keywords: Soil resources; Soil degradation; crop failure; maximum infiltration depth, resources use limit by plant; carrying vegetation capacity; the critical period of plant resources relationship regulation; sustainable use of soil resources; high-quality production